Polarization-entangled photon-pair generation in commercial-grade polarization-maintaining fiber

Abstract

We demonstrate a fiber-based source of polarization-entangled photon pairs at visible wavelengths suitable for integration with local quantum processing schemes. The photons are created through birefringent phase-matching in spontaneous four-wave mixing inside a Sagnac interferometer. We address entanglement degradation due to temporal distinguishability of the photons to enable the generation of a spectrally unfiltered polarization-entangled photon-pair state with $95.86\pm 0.10$ fidelity to a maximally entangled Bell state, evaluated with a tomographic state reconstruction without applying any corrections or background subtractions. Owing to the large birefringence of the fiber, photons are created far detuned from the pump, where Raman contamination is negligible. This source's spatial mode and ability to produce spectrally uncorrelated photons make it suitable for implementing quantum information protocols over free-space and fiber-based networks.

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References in corpus (7)

• Quantum Memories. A Review based on the European Integrated Project "Qubit Applications (QAP)"
• Photonic crystal fibre source of photon pairs for quantum information processing
• A pulsed Sagnac source of narrowband polarization-entangled photons
• High-quality polarization entanglement state preparation and manipulation in standard telecommunication channels
• Narrowband polarization-entangled photon pairs distributed over a WDM link for qubit networks
• Generating polarization-entangled photon pairs using cross-spliced birefringent fibers
• Optimal Generation of Pulsed Entangled Photon Pairs

Cited by in corpus (13)

• Fiber-based photon pair generation: a tutorial
• Photon pair generation by intermodal spontaneous four wave mixing in birefringent, weakly guiding optical fibers
• Photon pair generation in multimode optical fibers via intermodal phase-matching
• Polarization entangled photon-pair source based on quantum nonlinear photonics and interferometry
• Turn-Key Diode-Pumped All-Fiber Broadband Polarization-Entangled Photon Source
• Dual-Pump Approach to Photon-Pair Generation: Demonstration of Enhanced Characterization and Engineering Capabilities
• Configurable spatio-temporal properties in a photon-pair source based on spontaneous four wave mixing with multiple transverse modes
• Generation of heralded single photons beyond 1100 nm by spontaneous four-wave mixing in a side-stressed femtosecond laser-written waveguide
• Photon Pair Generation with Tailored Frequency Correlations in Graded-Index Multimode Optical Fibers
• Temporally versatile polarization entanglement from Bragg-reflection waveguides
• Generation of 1.5 μm discrete frequency entangled two-photon state in polarization maintaining fibers
• Complete evolution equation for the joint amplitude in photon-pair generation
• Implementable Hybrid Entanglement Witness